diff --git a/llvm/lib/IR/Metadata.cpp b/llvm/lib/IR/Metadata.cpp
@@ -545,6 +545,18 @@ static bool hasSelfReference(MDNode *N) {
 }
 
 MDNode *MDNode::replaceWithPermanentImpl() {
+  switch (getMetadataID()) {
+  default:
+    // If this type isn't uniquable, replace with a distinct node.
+    return replaceWithDistinctImpl();
+
+#define HANDLE_MDNODE_LEAF_UNIQUABLE(CLASS)                                    \
+  case CLASS##Kind:                                                            \
+    break;
+#include "llvm/IR/Metadata.def"
+  }
+
+  // Even if this type is uniquable, self-references have to be distinct.
   if (hasSelfReference(this))
     return replaceWithDistinctImpl();
   return replaceWithUniquedImpl();
@@ -671,8 +683,8 @@ MDNode *MDNode::uniquify() {
   // Try to insert into uniquing store.
   switch (getMetadataID()) {
   default:
-    llvm_unreachable("Invalid subclass of MDNode");
-#define HANDLE_MDNODE_LEAF(CLASS)                                              \
+    llvm_unreachable("Invalid or non-uniquable subclass of MDNode");
+#define HANDLE_MDNODE_LEAF_UNIQUABLE(CLASS)                                    \
   case CLASS##Kind: {                                                          \
     CLASS *SubclassThis = cast<CLASS>(this);                                   \
     std::integral_constant<bool, HasCachedHash<CLASS>::value>                  \
@@ -687,8 +699,8 @@ MDNode *MDNode::uniquify() {
 void MDNode::eraseFromStore() {
   switch (getMetadataID()) {
   default:
-    llvm_unreachable("Invalid subclass of MDNode");
-#define HANDLE_MDNODE_LEAF(CLASS)                                              \
+    llvm_unreachable("Invalid or non-uniquable subclass of MDNode");
+#define HANDLE_MDNODE_LEAF_UNIQUABLE(CLASS)                                    \
   case CLASS##Kind:                                                            \
     getContext().pImpl->CLASS##s.erase(cast<CLASS>(this));                     \
     break;

diff --git a/llvm/lib/IR/MetadataImpl.h b/llvm/lib/IR/MetadataImpl.h
@@ -26,6 +26,19 @@ static T *getUniqued(DenseSet<T *, InfoT> &Store,
   return I == Store.end() ? nullptr : *I;
 }
 
+template <class T> T *MDNode::storeImpl(T *N, StorageType Storage) {
+  switch (Storage) {
+  case Uniqued:
+    llvm_unreachable("Cannot unique without a uniquing-store");
+  case Distinct:
+    N->storeDistinctInContext();
+    break;
+  case Temporary:
+    break;
+  }
+  return N;
+}
+
 template <class T, class StoreT>
 T *MDNode::storeImpl(T *N, StorageType Storage, StoreT &Store) {
   switch (Storage) {

diff --git a/llvm/lib/IR/Verifier.cpp b/llvm/lib/IR/Verifier.cpp
@@ -887,6 +887,7 @@ void Verifier::visitDIFile(const DIFile &N) {
 }
 
 void Verifier::visitDICompileUnit(const DICompileUnit &N) {
+  Assert(N.isDistinct(), "compile units must be distinct", &N);
   Assert(N.getTag() == dwarf::DW_TAG_compile_unit, "invalid tag", &N);
 
   // Don't bother verifying the compilation directory or producer string

diff --git a/llvm/test/Assembler/2010-02-05-FunctionLocalMetadataBecomesNull.ll b/llvm/test/Assembler/2010-02-05-FunctionLocalMetadataBecomesNull.ll
@@ -25,7 +25,7 @@ define i32 @main() nounwind readonly {
 declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
 
 !7 = !{!1}
-!6 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 131941)", isOptimized: true, emissionKind: 0, file: !8, enums: !9, retainedTypes: !9, subprograms: !7)
+!6 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 131941)", isOptimized: true, emissionKind: 0, file: !8, enums: !9, retainedTypes: !9, subprograms: !7)
 !0 = !DILocalVariable(name: "c", line: 2, scope: !1, file: !2, type: !5)
 !1 = !DISubprogram(name: "main", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 1, file: !8, scope: !2, type: !3, function: i32 ()* @main)
 !2 = !DIFile(filename: "/d/j/debug-test.c", directory: "/Volumes/Data/b")

diff --git a/llvm/test/Assembler/dicompileunit.ll b/llvm/test/Assembler/dicompileunit.ll
@@ -1,8 +1,8 @@
 ; RUN: llvm-as < %s | llvm-dis | llvm-as | llvm-dis | FileCheck %s
 ; RUN: verify-uselistorder %s
 
-; CHECK: !named = !{!0, !1, !2, !3, !4, !5, !6, !7, !7, !8, !8}
-!named = !{!0, !1, !2, !3, !4, !5, !6, !7, !8, !9, !10}
+; CHECK: !named = !{!0, !1, !2, !3, !4, !5, !6, !7, !8}
+!named = !{!0, !1, !2, !3, !4, !5, !6, !7, !8}
 
 !0 = distinct !{}
 !1 = !DIFile(filename: "path/to/file", directory: "/path/to/dir")
@@ -12,20 +12,14 @@
 !5 = distinct !{}
 !6 = distinct !{}
 
-; CHECK: !7 = !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: true, flags: "-O2", runtimeVersion: 2, splitDebugFilename: "abc.debug", emissionKind: 3, enums: !2, retainedTypes: !3, subprograms: !4, globals: !5, imports: !6, dwoId: 42)
-!7 = !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang",
-                    isOptimized: true, flags: "-O2", runtimeVersion: 2,
-                    splitDebugFilename: "abc.debug", emissionKind: 3,
-                    enums: !2, retainedTypes: !3, subprograms: !4,
-                    globals: !5, imports: !6, dwoId: 42)
-!8 = !DICompileUnit(language: 12, file: !1, producer: "clang",
-                    isOptimized: true, flags: "-O2", runtimeVersion: 2,
-                    splitDebugFilename: "abc.debug", emissionKind: 3,
-                    enums: !2, retainedTypes: !3, subprograms: !4,
-                    globals: !5, imports: !6, dwoId: 42)
+; CHECK: !7 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: true, flags: "-O2", runtimeVersion: 2, splitDebugFilename: "abc.debug", emissionKind: 3, enums: !2, retainedTypes: !3, subprograms: !4, globals: !5, imports: !6, dwoId: 42)
+!7 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang",
+                             isOptimized: true, flags: "-O2", runtimeVersion: 2,
+                             splitDebugFilename: "abc.debug", emissionKind: 3,
+                             enums: !2, retainedTypes: !3, subprograms: !4,
+                             globals: !5, imports: !6, dwoId: 42)
 
-; CHECK: !8 = !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: false, runtimeVersion: 0, emissionKind: 0)
-!9 = !DICompileUnit(language: 12, file: !1, producer: "",
-                    isOptimized: false, flags: "", runtimeVersion: 0,
-                    splitDebugFilename: "", emissionKind: 0)
-!10 = !DICompileUnit(language: 12, file: !1)
+; CHECK: !8 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: false, runtimeVersion: 0, emissionKind: 0)
+!8 = distinct !DICompileUnit(language: 12, file: !1, producer: "",
+                             isOptimized: false, flags: "", runtimeVersion: 0,
+                             splitDebugFilename: "", emissionKind: 0)
diff --git a/llvm/test/Assembler/drop-debug-info.ll b/llvm/test/Assembler/drop-debug-info.ll
@@ -12,7 +12,7 @@ entry:
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!9}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 (trunk 195495) (llvm/trunk 195495:195504M)", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 (trunk 195495) (llvm/trunk 195495:195504M)", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "../llvm/tools/clang/test/CodeGen/debug-info-version.c", directory: "/Users/manmanren/llvm_gmail/release")
 !2 = !{i32 0}
 !3 = !{!4}

diff --git a/llvm/test/Assembler/invalid-dicompileunit-language-bad.ll b/llvm/test/Assembler/invalid-dicompileunit-language-bad.ll
@@ -1,5 +1,5 @@
 ; RUN: not llvm-as < %s -disable-output 2>&1 | FileCheck %s
 
-; CHECK: <stdin>:[[@LINE+1]]:31: error: invalid DWARF language 'DW_LANG_NoSuchLanguage'
-!0 = !DICompileUnit(language: DW_LANG_NoSuchLanguage,
-                    file: !DIFile(filename: "a", directory: "b"))
+; CHECK: <stdin>:[[@LINE+1]]:40: error: invalid DWARF language 'DW_LANG_NoSuchLanguage'
+!0 = distinct !DICompileUnit(language: DW_LANG_NoSuchLanguage,
+                             file: !DIFile(filename: "a", directory: "b"))
diff --git a/llvm/test/Assembler/invalid-dicompileunit-language-overflow.ll b/llvm/test/Assembler/invalid-dicompileunit-language-overflow.ll
@@ -1,9 +1,9 @@
 ; RUN: not llvm-as < %s -disable-output 2>&1 | FileCheck %s
 
 ; CHECK-NOT: error:
-!0 = !DICompileUnit(language: 65535,
-                    file: !DIFile(filename: "a", directory: "b"))
+!0 = distinct !DICompileUnit(language: 65535,
+                             file: !DIFile(filename: "a", directory: "b"))
 
-; CHECK: <stdin>:[[@LINE+1]]:31: error: value for 'language' too large, limit is 65535
-!1 = !DICompileUnit(language: 65536,
-                    file: !DIFile(filename: "a", directory: "b"))
+; CHECK: <stdin>:[[@LINE+1]]:40: error: value for 'language' too large, limit is 65535
+!1 = distinct !DICompileUnit(language: 65536,
+                             file: !DIFile(filename: "a", directory: "b"))
diff --git a/llvm/test/Assembler/invalid-dicompileunit-missing-language.ll b/llvm/test/Assembler/invalid-dicompileunit-missing-language.ll
@@ -1,4 +1,4 @@
 ; RUN: not llvm-as < %s -disable-output 2>&1 | FileCheck %s
 
-; CHECK: <stdin>:[[@LINE+1]]:65: error: missing required field 'language'
-!0 = !DICompileUnit(file: !DIFile(filename: "a", directory: "b"))
+; CHECK: <stdin>:[[@LINE+1]]:74: error: missing required field 'language'
+!0 = distinct !DICompileUnit(file: !DIFile(filename: "a", directory: "b"))
diff --git a/llvm/test/Assembler/invalid-dicompileunit-null-file.ll b/llvm/test/Assembler/invalid-dicompileunit-null-file.ll
@@ -1,4 +1,4 @@
 ; RUN: not llvm-as < %s -disable-output 2>&1 | FileCheck %s
 
-; CHECK: <stdin>:[[@LINE+1]]:27: error: 'file' cannot be null
-!0 = !DICompileUnit(file: null)
+; CHECK: <stdin>:[[@LINE+1]]:36: error: 'file' cannot be null
+!0 = distinct !DICompileUnit(file: null)
diff --git a/llvm/test/Assembler/invalid-dicompileunit-uniqued.ll b/llvm/test/Assembler/invalid-dicompileunit-uniqued.ll
@@ -0,0 +1,4 @@
+; RUN: not llvm-as < %s -disable-output 2>&1 | FileCheck %s
+
+; CHECK: <stdin>:[[@LINE+1]]:6: error: missing 'distinct', required for !DICompileUnit
+!0 = !DICompileUnit(language: DW_LANG_C99, file: !DIFile(filename: "file", directory: "/dir"))
diff --git a/llvm/test/Bitcode/DICompileUnit-no-DWOId.ll b/llvm/test/Bitcode/DICompileUnit-no-DWOId.ll
@@ -2,7 +2,7 @@
 ; default to 0, which is not displayed at all in the textual representation.
 ;
 ; RUN: llvm-dis %s.bc -o - | FileCheck %s
-; CHECK: !DICompileUnit
+; CHECK: distinct !DICompileUnit
 ; CHECK-NOT: dwoId:
 !named = !{!0}
 !0 = !DICompileUnit(language: 12, file: !1)

diff --git a/llvm/test/Bitcode/debug-loc-again.ll b/llvm/test/Bitcode/debug-loc-again.ll
@@ -29,8 +29,8 @@ entry:
 !llvm.module.flags = !{!0}
 
 !0 = !{i32 2, !"Debug Info Version", i32 3}
-!1 = !DICompileUnit(language: DW_LANG_C99, file: !DIFile(filename: "f", directory: "/d"),
-                    subprograms: !{!2})
+!1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !DIFile(filename: "f", directory: "/d"),
+                             subprograms: !{!2})
 !2 = !DISubprogram(name: "foo")
 !3 = !DILocation(line: 1, scope: !2)
 !4 = !DILocation(line: 2, scope: !2)
diff --git a/llvm/test/CodeGen/AArch64/aarch64-2014-08-11-MachineCombinerCrash.ll b/llvm/test/CodeGen/AArch64/aarch64-2014-08-11-MachineCombinerCrash.ll
@@ -44,7 +44,7 @@ attributes #1 = { nounwind readnone }
 !llvm.module.flags = !{!36, !37}
 !llvm.ident = !{!38}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.6.0 ", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.6.0 ", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "test.c", directory: "")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/CodeGen/AArch64/arm64-2011-03-17-AsmPrinterCrash.ll b/llvm/test/CodeGen/AArch64/arm64-2011-03-17-AsmPrinterCrash.ll
@@ -24,7 +24,7 @@ declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
 !0 = !DIGlobalVariable(name: "vsplive", line: 617, isLocal: true, isDefinition: true, scope: !1, file: !2, type: !6)
 !1 = !DISubprogram(name: "drt_vsprintf", line: 616, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, file: !20, scope: !2, type: !4)
 !2 = !DIFile(filename: "print.i", directory: "/Volumes/Ebi/echeng/radars/r9146594")
-!3 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (http://llvm.org/git/clang.git git:/git/puzzlebox/clang.git/ c4d1aea01c4444eb81bdbf391f1be309127c3cf1)", isOptimized: true, emissionKind: 0, file: !20, enums: !21, retainedTypes: !21)
+!3 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (http://llvm.org/git/clang.git git:/git/puzzlebox/clang.git/ c4d1aea01c4444eb81bdbf391f1be309127c3cf1)", isOptimized: true, emissionKind: 0, file: !20, enums: !21, retainedTypes: !21)
 !4 = !DISubroutineType(types: !5)
 !5 = !{!6}
 !6 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/CodeGen/ARM/2009-10-16-Scope.ll b/llvm/test/CodeGen/ARM/2009-10-16-Scope.ll
@@ -25,7 +25,7 @@ declare i32 @foo(i32) ssp
 !0 = !DILocation(line: 5, column: 2, scope: !1)
 !1 = distinct !DILexicalBlock(line: 1, column: 1, file: null, scope: !2)
 !2 = !DISubprogram(name: "bar", linkageName: "bar", line: 4, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, scope: !3)
-!3 = !DICompileUnit(language: DW_LANG_C99, producer: "clang 1.1", isOptimized: true, emissionKind: 0, file: !8, retainedTypes: !9)
+!3 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang 1.1", isOptimized: true, emissionKind: 0, file: !8, retainedTypes: !9)
 !4 = !DILocalVariable(name: "count_", line: 5, scope: !5, file: !3, type: !6)
 !5 = distinct !DILexicalBlock(line: 1, column: 1, file: null, scope: !1)
 !6 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/CodeGen/ARM/2010-04-15-ScavengerDebugValue.ll b/llvm/test/CodeGen/ARM/2010-04-15-ScavengerDebugValue.ll
@@ -18,7 +18,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 !1 = !DISubprogram(name: "__addvsi3", linkageName: "__addvsi3", line: 94, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, file: !12, scope: null, type: !4)
 !2 = !DIFile(filename: "libgcc2.c", directory: "/Users/bwilson/local/nightly/test-2010-04-14/build/llvmgcc.roots/llvmgcc~obj/src/gcc")
 !12 = !DIFile(filename: "libgcc2.c", directory: "/Users/bwilson/local/nightly/test-2010-04-14/build/llvmgcc.roots/llvmgcc~obj/src/gcc")
-!3 = !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build 00)", isOptimized: true, emissionKind: 0, file: !12, enums: !13, retainedTypes: !13, subprograms: !14)
+!3 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build 00)", isOptimized: true, emissionKind: 0, file: !12, enums: !13, retainedTypes: !13, subprograms: !14)
 !4 = !DISubroutineType(types: !5)
 !5 = !{!6, !6, !6}
 !6 = !DIDerivedType(tag: DW_TAG_typedef, name: "SItype", line: 152, file: !12, baseType: !8)

diff --git a/llvm/test/CodeGen/ARM/2010-06-25-Thumb2ITInvalidIterator.ll b/llvm/test/CodeGen/ARM/2010-06-25-Thumb2ITInvalidIterator.ll
@@ -50,7 +50,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 !0 = !DILocalVariable(name: "buf", line: 4, arg: 1, scope: !1, file: !2, type: !6)
 !1 = !DISubprogram(name: "x0", linkageName: "x0", line: 5, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, file: !26, scope: null, type: !4)
 !2 = !DIFile(filename: "t.c", directory: "/private/tmp")
-!3 = !DICompileUnit(language: DW_LANG_C99, producer: "clang 2.0", isOptimized: true, file: !26)
+!3 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang 2.0", isOptimized: true, file: !26)
 !4 = !DISubroutineType(types: !5)
 !5 = !{null}
 !6 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 32, align: 32, file: !26, scope: !2, baseType: !7)

diff --git a/llvm/test/CodeGen/ARM/2010-08-04-StackVariable.ll b/llvm/test/CodeGen/ARM/2010-08-04-StackVariable.ll
@@ -80,7 +80,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 !0 = !DISubprogram(name: "SVal", line: 11, isLocal: false, isDefinition: false, virtualIndex: 6, isOptimized: false, file: !48, scope: !1, type: !14)
 !1 = !DICompositeType(tag: DW_TAG_structure_type, name: "SVal", line: 1, size: 128, align: 64, file: !48, elements: !4)
 !2 = !DIFile(filename: "small.cc", directory: "/Users/manav/R8248330")
-!3 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: 1, file: !48, enums: !47, retainedTypes: !47, subprograms: !46, globals: !47, imports:  !47)
+!3 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: 1, file: !48, enums: !47, retainedTypes: !47, subprograms: !46, globals: !47, imports:  !47)
 !4 = !{!5, !7, !0, !9}
 !5 = !DIDerivedType(tag: DW_TAG_member, name: "Data", line: 7, size: 64, align: 64, file: !48, scope: !1, baseType: !6)
 !6 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, file: !48, baseType: null)

diff --git a/llvm/test/CodeGen/ARM/2011-01-19-MergedGlobalDbg.ll b/llvm/test/CodeGen/ARM/2011-01-19-MergedGlobalDbg.ll
@@ -80,7 +80,7 @@ entry:
 
 !0 = !DISubprogram(name: "get1", linkageName: "get1", line: 4, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 4, file: !47, scope: !1, type: !3, function: i8 (i8)* @get1, variables: !42)
 !1 = !DIFile(filename: "foo.c", directory: "/tmp/")
-!2 = !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2369.8)", isOptimized: true, emissionKind: 0, file: !47, enums: !48, retainedTypes: !48, subprograms: !40, globals: !41, imports:  !48)
+!2 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2369.8)", isOptimized: true, emissionKind: 0, file: !47, enums: !48, retainedTypes: !48, subprograms: !40, globals: !41, imports:  !48)
 !3 = !DISubroutineType(types: !4)
 !4 = !{!5, !5}
 !5 = !DIBasicType(tag: DW_TAG_base_type, name: "_Bool", size: 8, align: 8, encoding: DW_ATE_boolean)

diff --git a/llvm/test/CodeGen/ARM/2011-08-02-MergedGlobalDbg.ll b/llvm/test/CodeGen/ARM/2011-08-02-MergedGlobalDbg.ll
@@ -73,7 +73,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!49}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang", isOptimized: true, emissionKind: 1, file: !47, enums: !48, retainedTypes: !48, subprograms: !40, globals: !41, imports:  !48)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang", isOptimized: true, emissionKind: 1, file: !47, enums: !48, retainedTypes: !48, subprograms: !40, globals: !41, imports:  !48)
 !1 = !DISubprogram(name: "get1", line: 5, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 5, file: !47, scope: !2, type: !3, function: i32 (i32)* @get1, variables: !42)
 !2 = !DIFile(filename: "ss3.c", directory: "/private/tmp")
 !3 = !DISubroutineType(types: !4)

diff --git a/llvm/test/CodeGen/ARM/coalesce-dbgvalue.ll b/llvm/test/CodeGen/ARM/coalesce-dbgvalue.ll
@@ -79,7 +79,7 @@ attributes #3 = { nounwind }
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!33}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.4 (trunk 182024) (llvm/trunk 182023)", isOptimized: true, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !15, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.4 (trunk 182024) (llvm/trunk 182023)", isOptimized: true, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !15, imports: !2)
 !1 = !DIFile(filename: "pr16110.c", directory: "/d/b")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/CodeGen/ARM/debug-frame-vararg.ll b/llvm/test/CodeGen/ARM/debug-frame-vararg.ll
@@ -25,7 +25,7 @@
 !llvm.module.flags = !{!9, !10}
 !llvm.ident = !{!11}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "var.c", directory: "/tmp")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/CodeGen/ARM/debug-frame.ll b/llvm/test/CodeGen/ARM/debug-frame.ll
@@ -125,7 +125,7 @@ declare void @_ZSt9terminatev()
 !llvm.module.flags = !{!10, !11}
 !llvm.ident = !{!12}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "exp.cpp", directory: "/tmp")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/CodeGen/ARM/debug-info-arg.ll b/llvm/test/CodeGen/ARM/debug-info-arg.ll
@@ -32,7 +32,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!33}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "Apple clang version 3.0 (tags/Apple/clang-211.10.1) (based on LLVM 3.0svn)", isOptimized: true, emissionKind: 1, file: !32, enums: !{}, retainedTypes: !{}, subprograms: !30, imports:  null)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "Apple clang version 3.0 (tags/Apple/clang-211.10.1) (based on LLVM 3.0svn)", isOptimized: true, emissionKind: 1, file: !32, enums: !{}, retainedTypes: !{}, subprograms: !30, imports:  null)
 !1 = !DISubprogram(name: "foo", line: 11, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 11, file: !2, scope: !2, type: !3, function: void (%struct.tag_s*, %struct.tag_s*, i64, i64, %struct.tag_s*, %struct.tag_s*)* @foo, variables: !31)
 !2 = !DIFile(filename: "one.c", directory: "/Volumes/Athwagate/R10048772")
 !3 = !DISubroutineType(types: !4)

diff --git a/llvm/test/CodeGen/ARM/debug-info-blocks.ll b/llvm/test/CodeGen/ARM/debug-info-blocks.ll
@@ -95,7 +95,7 @@ define hidden void @foobar_func_block_invoke_0(i8* %.block_descriptor, %0* %load
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!162}
 
-!0 = !DICompileUnit(language: DW_LANG_ObjC, producer: "Apple clang version 2.1", isOptimized: false, runtimeVersion: 2, emissionKind: 1, file: !153, enums: !147, retainedTypes: !{}, subprograms: !148)
+!0 = distinct !DICompileUnit(language: DW_LANG_ObjC, producer: "Apple clang version 2.1", isOptimized: false, runtimeVersion: 2, emissionKind: 1, file: !153, enums: !147, retainedTypes: !{}, subprograms: !148)
 !1 = !DICompositeType(tag: DW_TAG_enumeration_type, line: 248, size: 32, align: 32, file: !160, scope: !0, elements: !3)
 !2 = !DIFile(filename: "header.h", directory: "/Volumes/Sandbox/llvm")
 !3 = !{!4}

diff --git a/llvm/test/CodeGen/ARM/debug-info-branch-folding.ll b/llvm/test/CodeGen/ARM/debug-info-branch-folding.ll
@@ -44,7 +44,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 
 !0 = !DISubprogram(name: "test0001", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, file: !54, scope: null, type: !3, function: <4 x float> (float)* @test0001, variables: !51)
 !1 = !DIFile(filename: "build2.c", directory: "/private/tmp")
-!2 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 129915)", isOptimized: true, emissionKind: 1, file: !54, enums: !{}, retainedTypes: !{}, subprograms: !50, imports:  null)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 129915)", isOptimized: true, emissionKind: 1, file: !54, enums: !{}, retainedTypes: !{}, subprograms: !50, imports:  null)
 !3 = !DISubroutineType(types: !4)
 !4 = !{!5}
 !5 = !DIDerivedType(tag: DW_TAG_typedef, name: "v4f32", line: 14, file: !54, scope: !2, baseType: !6)

diff --git a/llvm/test/CodeGen/ARM/debug-info-d16-reg.ll b/llvm/test/CodeGen/ARM/debug-info-d16-reg.ll
@@ -61,7 +61,7 @@ declare i32 @puts(i8* nocapture) nounwind
 
 !0 = !DISubprogram(name: "printer", linkageName: "printer", line: 12, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 12, file: !46, scope: !1, type: !3, function: i32 (i8*, double, i8)* @printer, variables: !43)
 !1 = !DIFile(filename: "a.c", directory: "/tmp/")
-!2 = !DICompileUnit(language: DW_LANG_C89, producer: "(LLVM build 00)", isOptimized: true, emissionKind: 1, file: !46, enums: !47, retainedTypes: !47, subprograms: !42, imports:  null)
+!2 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "(LLVM build 00)", isOptimized: true, emissionKind: 1, file: !46, enums: !47, retainedTypes: !47, subprograms: !42, imports:  null)
 !3 = !DISubroutineType(types: !4)
 !4 = !{!5, !6, !7, !8}
 !5 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/CodeGen/ARM/debug-info-no-frame.ll b/llvm/test/CodeGen/ARM/debug-info-no-frame.ll
@@ -21,7 +21,7 @@ attributes #1 = { nounwind readnone }
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!7, !8}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false)
 !1 = !DIFile(filename: "file.c", directory: "/dir")
 !2 = !{}
 !3 = !DISubprogram(name: "need_cfi_def_cfa_offset", scope: !1, file: !1, line: 1, type: !4, isLocal: false, isDefinition: true, scopeLine: 2, isOptimized: false, function: void ()* @need_cfi_def_cfa_offset, variables: !2)

diff --git a/llvm/test/CodeGen/ARM/debug-info-qreg.ll b/llvm/test/CodeGen/ARM/debug-info-qreg.ll
@@ -40,7 +40,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 
 !0 = !DISubprogram(name: "test0001", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 3, file: !54, scope: !1, type: !3, function: <4 x float> (float)* @test0001, variables: !51)
 !1 = !DIFile(filename: "build2.c", directory: "/private/tmp")
-!2 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 129915)", isOptimized: true, emissionKind: 1, file: !54, enums: !{}, retainedTypes: !{}, subprograms: !50, imports:  null)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 129915)", isOptimized: true, emissionKind: 1, file: !54, enums: !{}, retainedTypes: !{}, subprograms: !50, imports:  null)
 !3 = !DISubroutineType(types: !4)
 !4 = !{!5}
 !5 = !DIDerivedType(tag: DW_TAG_typedef, name: "v4f32", line: 14, file: !54, scope: !2, baseType: !6)

diff --git a/llvm/test/CodeGen/ARM/debug-info-s16-reg.ll b/llvm/test/CodeGen/ARM/debug-info-s16-reg.ll
@@ -67,7 +67,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 
 !0 = !DISubprogram(name: "inlineprinter", line: 5, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 5, file: !51, scope: !1, type: !3, function: i32 (i8*, float, i8)* @inlineprinter, variables: !48)
 !1 = !DIFile(filename: "a.c", directory: "/private/tmp")
-!2 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 129915)", isOptimized: true, emissionKind: 1, file: !51, enums: !52, retainedTypes: !52, subprograms: !47, imports:  null)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 129915)", isOptimized: true, emissionKind: 1, file: !51, enums: !52, retainedTypes: !52, subprograms: !47, imports:  null)
 !3 = !DISubroutineType(types: !4)
 !4 = !{!5}
 !5 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/CodeGen/ARM/debug-info-sreg2.ll b/llvm/test/CodeGen/ARM/debug-info-sreg2.ll
@@ -43,7 +43,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!20}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.0 (trunk 130845)", isOptimized: true, emissionKind: 1, file: !18, enums: !19, retainedTypes: !19, subprograms: !16, imports:  null)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.0 (trunk 130845)", isOptimized: true, emissionKind: 1, file: !18, enums: !19, retainedTypes: !19, subprograms: !16, imports:  null)
 !1 = !DISubprogram(name: "foo", linkageName: "_Z3foov", line: 5, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 5, file: !18, scope: !2, type: !3, function: void ()* @_Z3foov, variables: !17)
 !2 = !DIFile(filename: "k.cc", directory: "/private/tmp")
 !3 = !DISubroutineType(types: !4)

diff --git a/llvm/test/CodeGen/ARM/debug-segmented-stacks.ll b/llvm/test/CodeGen/ARM/debug-segmented-stacks.ll
@@ -39,7 +39,7 @@ define void @test_basic() #0 {
 ; ARM-linux       .cfi_same_value r5
 }
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "var.c", directory: "/tmp")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/CodeGen/ARM/sched-it-debug-nodes.ll b/llvm/test/CodeGen/ARM/sched-it-debug-nodes.ll
@@ -50,7 +50,7 @@ attributes #3 = { nounwind }
 !llvm.module.flags = !{!23, !24, !25, !26}
 !llvm.ident = !{!27}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0  (llvm/trunk 237059)", isOptimized: true, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0  (llvm/trunk 237059)", isOptimized: true, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "<stdin>", directory: "/Users/compnerd/Source/llvm")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/CodeGen/ARM/vfp-regs-dwarf.ll b/llvm/test/CodeGen/ARM/vfp-regs-dwarf.ll
@@ -31,7 +31,7 @@ define void @stack_offsets() {
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!8, !9}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "tmp.c", directory: "/Users/tim/llvm/build")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/CodeGen/Hexagon/hwloop-dbg.ll b/llvm/test/CodeGen/Hexagon/hwloop-dbg.ll
@@ -37,7 +37,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!29}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "QuIC LLVM Hexagon Clang version 6.1-pre-unknown, (git://git-hexagon-aus.quicinc.com/llvm/clang-mainline.git e9382867661454cdf44addb39430741578e9765c) (llvm/llvm-mainline.git 36412bb1fcf03ed426d4437b41198bae066675ac)", isOptimized: true, emissionKind: 1, file: !28, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "QuIC LLVM Hexagon Clang version 6.1-pre-unknown, (git://git-hexagon-aus.quicinc.com/llvm/clang-mainline.git e9382867661454cdf44addb39430741578e9765c) (llvm/llvm-mainline.git 36412bb1fcf03ed426d4437b41198bae066675ac)", isOptimized: true, emissionKind: 1, file: !28, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2)
 !2 = !{}
 !3 = !{!5}
 !5 = !DISubprogram(name: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 1, file: !28, scope: null, type: !7, function: void (i32*, i32*)* @foo, variables: !11)

diff --git a/llvm/test/CodeGen/Inputs/DbgValueOtherTargets.ll b/llvm/test/CodeGen/Inputs/DbgValueOtherTargets.ll
@@ -16,7 +16,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 
 !0 = !DISubprogram(name: "main", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, file: !12, scope: !1, type: !3, function: i32 ()* @main)
 !1 = !DIFile(filename: "/tmp/x.c", directory: "/Users/manav")
-!2 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 2.9 (trunk 120996)", isOptimized: false, emissionKind: 0, file: !12, enums: !6, retainedTypes: !6, subprograms: !11)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 2.9 (trunk 120996)", isOptimized: false, emissionKind: 0, file: !12, enums: !6, retainedTypes: !6, subprograms: !11)
 !3 = !DISubroutineType(types: !4)
 !4 = !{!5}
 !5 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/CodeGen/MIR/X86/expected-metadata-node-after-debug-location.mir b/llvm/test/CodeGen/MIR/X86/expected-metadata-node-after-debug-location.mir
@@ -20,7 +20,7 @@
   !llvm.module.flags = !{!9, !10}
   !llvm.ident = !{!11}
 
-  !0 = !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
   !1 = !DIFile(filename: "test.ll", directory: "")
   !2 = !{}
   !3 = !{!4}

diff --git a/llvm/test/CodeGen/MIR/X86/expected-metadata-node-after-exclaim.mir b/llvm/test/CodeGen/MIR/X86/expected-metadata-node-after-exclaim.mir
@@ -20,7 +20,7 @@
   !llvm.module.flags = !{!9, !10}
   !llvm.ident = !{!11}
 
-  !0 = !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
   !1 = !DIFile(filename: "test.ll", directory: "")
   !2 = !{}
   !3 = !{!4}

diff --git a/llvm/test/CodeGen/MIR/X86/instructions-debug-location.mir b/llvm/test/CodeGen/MIR/X86/instructions-debug-location.mir
@@ -22,7 +22,7 @@
   !llvm.module.flags = !{!9, !10}
   !llvm.ident = !{!11}
 
-  !0 = !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
   !1 = !DIFile(filename: "test.ll", directory: "")
   !2 = !{}
   !3 = !{!4}

diff --git a/llvm/test/CodeGen/MIR/X86/metadata-operands.mir b/llvm/test/CodeGen/MIR/X86/metadata-operands.mir
@@ -22,7 +22,7 @@
   !llvm.module.flags = !{!9, !10}
   !llvm.ident = !{!11}
 
-  !0 = !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
   !1 = !DIFile(filename: "test.ll", directory: "")
   !2 = !{}
   !3 = !{!4}

diff --git a/llvm/test/CodeGen/MIR/X86/unknown-metadata-node.mir b/llvm/test/CodeGen/MIR/X86/unknown-metadata-node.mir
@@ -20,7 +20,7 @@
   !llvm.module.flags = !{!9, !10}
   !llvm.ident = !{!11}
 
-  !0 = !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
   !1 = !DIFile(filename: "test.ll", directory: "")
   !2 = !{}
   !3 = !{!4}

diff --git a/llvm/test/CodeGen/PowerPC/dbg.ll b/llvm/test/CodeGen/PowerPC/dbg.ll
@@ -17,7 +17,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!22}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.1", isOptimized: true, emissionKind: 0, file: !21, enums: !1, retainedTypes: !1, subprograms: !3, globals: !1, imports: !1)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.1", isOptimized: true, emissionKind: 0, file: !21, enums: !1, retainedTypes: !1, subprograms: !3, globals: !1, imports: !1)
 !1 = !{}
 !3 = !{!5}
 !5 = !DISubprogram(name: "main", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, file: !21, scope: null, type: !7, function: i32 (i32, i8**)* @main, variables: !13)

diff --git a/llvm/test/CodeGen/PowerPC/pr17168.ll b/llvm/test/CodeGen/PowerPC/pr17168.ll
@@ -54,7 +54,7 @@ attributes #1 = { nounwind readnone }
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!438, !464}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.4 (trunk 190311)", isOptimized: true, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !298, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.4 (trunk 190311)", isOptimized: true, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !298, imports: !2)
 !1 = !DIFile(filename: "bt.c", directory: "/home/hfinkel/src/NPB2.3-omp-C/BT")
 !2 = !{}
 !3 = !{!4, !82, !102, !114, !132, !145, !154, !155, !162, !183, !200, !201, !207, !208, !215, !221, !230, !238, !246, !255, !260, !261, !268, !274, !279, !280, !287, !293}

diff --git a/llvm/test/CodeGen/PowerPC/unwind-dw2-g.ll b/llvm/test/CodeGen/PowerPC/unwind-dw2-g.ll
@@ -21,7 +21,7 @@ attributes #0 = { nounwind }
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!8, !11}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.4", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.4", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "/tmp/unwind-dw2.c", directory: "/tmp")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/CodeGen/Thumb/2010-07-15-debugOrdering.ll b/llvm/test/CodeGen/Thumb/2010-07-15-debugOrdering.ll
@@ -53,7 +53,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 !2 = distinct !DILexicalBlock(line: 44, column: 0, file: !101, scope: !3)
 !3 = !DISubprogram(name: "getClosestDiagonal3", linkageName: "_Z19getClosestDiagonal3ii", line: 44, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, file: !101, scope: null, type: !6)
 !4 = !DIFile(filename: "ggEdgeDiscrepancy.cc", directory: "/Volumes/Home/grosbaj/sources/llvm-externals/speccpu2000/benchspec/CINT2000/252.eon/src")
-!5 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build 00)", isOptimized: true, emissionKind: 0, file: !101, enums: !102, retainedTypes: !102, subprograms: !103)
+!5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build 00)", isOptimized: true, emissionKind: 0, file: !101, enums: !102, retainedTypes: !102, subprograms: !103)
 !6 = !DISubroutineType(types: !7)
 !7 = !{!8, !22, !22}
 !8 = !DICompositeType(tag: DW_TAG_structure_type, name: "ggVector3", line: 66, size: 192, align: 32, file: !99, elements: !10)

diff --git a/llvm/test/CodeGen/X86/2009-02-12-DebugInfoVLA.ll b/llvm/test/CodeGen/X86/2009-02-12-DebugInfoVLA.ll
@@ -78,7 +78,7 @@ declare void @llvm.stackrestore(i8*) nounwind
 
 !0 = !DILocalVariable(name: "s1", line: 2, arg: 1, scope: !1, file: !2, type: !6)
 !1 = !DISubprogram(name: "foo", linkageName: "foo", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, scope: !2, type: !3)
-!2 = !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: 0, file: !17, enums: !18, retainedTypes: !18)
+!2 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: 0, file: !17, enums: !18, retainedTypes: !18)
 !3 = !DISubroutineType(types: !4)
 !4 = !{!5, !6}
 !5 = !DIBasicType(tag: DW_TAG_base_type, name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)

diff --git a/llvm/test/CodeGen/X86/2009-10-16-Scope.ll b/llvm/test/CodeGen/X86/2009-10-16-Scope.ll
@@ -25,7 +25,7 @@ declare i32 @foo(i32) ssp
 !0 = !DILocation(line: 5, column: 2, scope: !1)
 !1 = distinct !DILexicalBlock(line: 1, column: 1, file: null, scope: !2)
 !2 = !DISubprogram(name: "bar", linkageName: "bar", line: 4, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, scope: !3)
-!3 = !DICompileUnit(language: DW_LANG_C99, producer: "clang 1.1", isOptimized: true, emissionKind: 0, file: !8, retainedTypes: !9)
+!3 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang 1.1", isOptimized: true, emissionKind: 0, file: !8, retainedTypes: !9)
 !4 = !DILocalVariable(name: "count_", line: 5, scope: !5, file: !3, type: !6)
 !5 = distinct !DILexicalBlock(line: 1, column: 1, file: null, scope: !1)
 !6 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/CodeGen/X86/2010-01-18-DbgValue.ll b/llvm/test/CodeGen/X86/2010-01-18-DbgValue.ll
@@ -34,7 +34,7 @@ declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
 !0 = !DILocalVariable(name: "my_r0", line: 11, arg: 1, scope: !1, file: !2, type: !7)
 !1 = !DISubprogram(name: "foo", linkageName: "foo", line: 11, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, scopeLine: 11, file: !19, scope: !2, type: !4, function: double (%struct.Rect*)* @foo)
 !2 = !DIFile(filename: "b2.c", directory: "/tmp/")
-!3 = !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: 0, file: !19, enums: !20, retainedTypes: !20, subprograms: !18)
+!3 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: 0, file: !19, enums: !20, retainedTypes: !20, subprograms: !18)
 !4 = !DISubroutineType(types: !5)
 !5 = !{!6, !7}
 !6 = !DIBasicType(tag: DW_TAG_base_type, name: "double", size: 64, align: 64, encoding: DW_ATE_float)

diff --git a/llvm/test/CodeGen/X86/2010-02-01-DbgValueCrash.ll b/llvm/test/CodeGen/X86/2010-02-01-DbgValueCrash.ll
@@ -16,7 +16,7 @@ entry:
 declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnone
 declare void @"tart.reflect.ComplexType.create->tart.core.Object"(%tart.reflect.ComplexType*) nounwind readnone
 
-!0 = !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: 0, file: !15, enums: !16, retainedTypes: !16)
+!0 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: 0, file: !15, enums: !16, retainedTypes: !16)
 !1 = !DIDerivedType(tag: DW_TAG_const_type, size: 192, align: 64, file: !15, scope: !0, baseType: !2)
 !2 = !DICompositeType(tag: DW_TAG_structure_type, name: "C", line: 1, size: 192, align: 64, file: !15, scope: !0, elements: !3)
 !3 = !{!4, !6, !7}

diff --git a/llvm/test/CodeGen/X86/2010-05-25-DotDebugLoc.ll b/llvm/test/CodeGen/X86/2010-05-25-DotDebugLoc.ll
@@ -202,7 +202,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 !0 = !DILocalVariable(name: "a", line: 1921, arg: 1, scope: !1, file: !2, type: !9)
 !1 = !DISubprogram(name: "__divsc3", linkageName: "__divsc3", line: 1922, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, scopeLine: 1922, file: !45, scope: !2, type: !4, function: %0 (float, float, float, float)* @__divsc3, variables: !43)
 !2 = !DIFile(filename: "libgcc2.c", directory: "/Users/yash/clean/LG.D/gcc/../../llvmgcc/gcc")
-!3 = !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: 1, file: !45, enums: !47, retainedTypes: !47, subprograms: !44, imports:  null)
+!3 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: 1, file: !45, enums: !47, retainedTypes: !47, subprograms: !44, imports:  null)
 !4 = !DISubroutineType(types: !5)
 !5 = !{!6, !9, !9, !9, !9}
 !6 = !DIDerivedType(tag: DW_TAG_typedef, name: "SCtype", line: 170, file: !46, scope: !7, baseType: !8)

diff --git a/llvm/test/CodeGen/X86/2010-05-26-DotDebugLoc.ll b/llvm/test/CodeGen/X86/2010-05-26-DotDebugLoc.ll
@@ -26,7 +26,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 
 !0 = !DIGlobalVariable(name: "ret", line: 7, isLocal: false, isDefinition: true, scope: !1, file: !1, type: !3)
 !1 = !DIFile(filename: "foo.c", directory: "/tmp/")
-!2 = !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: 1, file: !36, enums: !37, retainedTypes: !37, subprograms: !32, globals: !31, imports:  !37)
+!2 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: 1, file: !36, enums: !37, retainedTypes: !37, subprograms: !32, globals: !31, imports:  !37)
 !3 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
 !4 = !DILocalVariable(name: "x", line: 12, arg: 1, scope: !5, file: !1, type: !3)
 !5 = !DISubprogram(name: "foo", linkageName: "foo", line: 13, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, scopeLine: 13, file: !36, scope: !1, type: !6, function: void (i32)* @foo, variables: !33)

diff --git a/llvm/test/CodeGen/X86/2010-05-28-Crash.ll b/llvm/test/CodeGen/X86/2010-05-28-Crash.ll
@@ -28,7 +28,7 @@ entry:
 !0 = !DILocalVariable(name: "y", line: 2, arg: 1, scope: !1, file: !2, type: !6)
 !1 = !DISubprogram(name: "foo", linkageName: "foo", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, scopeLine: 2, file: !18, scope: !2, type: !4, function: i32 (i32)* @foo, variables: !15)
 !2 = !DIFile(filename: "f.c", directory: "/tmp")
-!3 = !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: 1, file: !18, enums: !19, retainedTypes: !19, subprograms: !17, imports:  null)
+!3 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: 1, file: !18, enums: !19, retainedTypes: !19, subprograms: !17, imports:  null)
 !4 = !DISubroutineType(types: !5)
 !5 = !{!6, !6}
 !6 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/CodeGen/X86/2010-06-01-DeadArg-DbgInfo.ll b/llvm/test/CodeGen/X86/2010-06-01-DeadArg-DbgInfo.ll
@@ -27,7 +27,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 !1 = !DISubprogram(name: "bar", linkageName: "_ZN3foo3barEi", line: 11, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, scopeLine: 11, file: !31, scope: !2, type: !9, function: i32 (%struct.foo*, i32)* null)
 !2 = !DICompositeType(tag: DW_TAG_structure_type, name: "foo", line: 3, size: 32, align: 32, file: !31, scope: !3, elements: !5)
 !3 = !DIFile(filename: "foo.cp", directory: "/tmp/")
-!4 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "4.2.1 LLVM build", isOptimized: true, emissionKind: 0, file: !31, enums: !32, retainedTypes: !32, subprograms: !33)
+!4 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "4.2.1 LLVM build", isOptimized: true, emissionKind: 0, file: !31, enums: !32, retainedTypes: !32, subprograms: !33)
 !5 = !{!6, !1, !8}
 !6 = !DIDerivedType(tag: DW_TAG_member, name: "y", line: 8, size: 32, align: 32, file: !31, scope: !2, baseType: !7)
 !7 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/CodeGen/X86/2010-07-06-DbgCrash.ll b/llvm/test/CodeGen/X86/2010-07-06-DbgCrash.ll
@@ -4,7 +4,7 @@
 @.str1 = private constant [4 x i8] c"two\00", align 1 ; <[5 x i8]*> [#uses=1]
 @C.9.2167 = internal constant [2 x i8*] [i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str1, i64 0, i64 0)]
 !38 = !DIFile(filename: "pbmsrch.c", directory: "/Users/grawp/LLVM/test-suite/MultiSource/Benchmarks/MiBench/office-stringsearch")
-!39 = !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build 9999)", isOptimized: true, emissionKind: 0, file: !109, enums: !108, retainedTypes: !108)
+!39 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build 9999)", isOptimized: true, emissionKind: 0, file: !109, enums: !108, retainedTypes: !108)
 !46 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, file: !109, baseType: !47)
 !47 = !DIBasicType(tag: DW_TAG_base_type, name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
 !97 = !DISubprogram(name: "main", linkageName: "main", line: 73, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, scope: !39, type: !98)

diff --git a/llvm/test/CodeGen/X86/2010-08-04-StackVariable.ll b/llvm/test/CodeGen/X86/2010-08-04-StackVariable.ll
@@ -81,7 +81,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 !0 = !DISubprogram(name: "SVal", line: 11, isLocal: false, isDefinition: false, virtualIndex: 6, isOptimized: false, scopeLine: 11, file: !47, scope: !1, type: !14)
 !1 = !DICompositeType(tag: DW_TAG_structure_type, name: "SVal", line: 1, size: 128, align: 64, file: !47, scope: !2, elements: !4)
 !2 = !DIFile(filename: "small.cc", directory: "/Users/manav/R8248330")
-!3 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: 1, file: !47, enums: !48, retainedTypes: !48, subprograms: !46, imports:  null)
+!3 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: 1, file: !47, enums: !48, retainedTypes: !48, subprograms: !46, imports:  null)
 !4 = !{!5, !7, !0, !9}
 !5 = !DIDerivedType(tag: DW_TAG_member, name: "Data", line: 7, size: 64, align: 64, file: !47, scope: !1, baseType: !6)
 !6 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, file: !47, scope: !2, baseType: null)

diff --git a/llvm/test/CodeGen/X86/2010-09-16-EmptyFilename.ll b/llvm/test/CodeGen/X86/2010-09-16-EmptyFilename.ll
@@ -17,7 +17,7 @@ entry:
 
 !0 = !DISubprogram(name: "foo", linkageName: "foo", line: 53, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, file: !14, scope: !1, type: !3, function: i32 ()* @foo)
 !1 = !DIFile(filename: "", directory: "/private/tmp")
-!2 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 2.9 (trunk 114084)", isOptimized: false, emissionKind: 0, file: !15, enums: !16, retainedTypes: !16, subprograms: !13)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 2.9 (trunk 114084)", isOptimized: false, emissionKind: 0, file: !15, enums: !16, retainedTypes: !16, subprograms: !13)
 !3 = !DISubroutineType(types: !4)
 !4 = !{!5}
 !5 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/CodeGen/X86/2010-11-02-DbgParameter.ll b/llvm/test/CodeGen/X86/2010-11-02-DbgParameter.ll
@@ -20,7 +20,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 
 !0 = !DISubprogram(name: "foo", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 3, file: !17, scope: !1, type: !3, function: i32 (%struct.bar*)* @foo, variables: !16)
 !1 = !DIFile(filename: "one.c", directory: "/private/tmp")
-!2 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 2.9 (trunk 117922)", isOptimized: true, emissionKind: 0, file: !17, enums: !18, retainedTypes: !18, subprograms: !15, imports:  null)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 2.9 (trunk 117922)", isOptimized: true, emissionKind: 0, file: !17, enums: !18, retainedTypes: !18, subprograms: !15, imports:  null)
 !3 = !DISubroutineType(types: !4)
 !4 = !{!5}
 !5 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/CodeGen/X86/2011-01-24-DbgValue-Before-Use.ll b/llvm/test/CodeGen/X86/2011-01-24-DbgValue-Before-Use.ll
@@ -80,7 +80,7 @@ declare i32 @puts(i8* nocapture) nounwind
 
 !0 = !DISubprogram(name: "gcd", line: 5, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, file: !31, scope: !1, type: !3, function: i64 (i64, i64)* @gcd, variables: !29)
 !1 = !DIFile(filename: "rem_small.c", directory: "/private/tmp")
-!2 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 2.9 (trunk 124117)", isOptimized: true, emissionKind: 1, file: !31, enums: !32, retainedTypes: !32, subprograms: !28, imports:  null)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 2.9 (trunk 124117)", isOptimized: true, emissionKind: 1, file: !31, enums: !32, retainedTypes: !32, subprograms: !28, imports:  null)
 !3 = !DISubroutineType(types: !4)
 !4 = !{!5}
 !5 = !DIBasicType(tag: DW_TAG_base_type, name: "long int", size: 64, align: 64, encoding: DW_ATE_signed)

diff --git a/llvm/test/CodeGen/X86/2012-11-30-handlemove-dbg.ll b/llvm/test/CodeGen/X86/2012-11-30-handlemove-dbg.ll
@@ -38,7 +38,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!12}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.3 (trunk 168918) (llvm/trunk 168920)", isOptimized: true, emissionKind: 0, file: !11, enums: !2, retainedTypes: !2, subprograms: !13, globals: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.3 (trunk 168918) (llvm/trunk 168920)", isOptimized: true, emissionKind: 0, file: !11, enums: !2, retainedTypes: !2, subprograms: !13, globals: !2)
 !2 = !{}
 !4 = !DILocalVariable(name: "hg", line: 725, arg: 4, scope: !14, file: !5, type: !6)
 !5 = !DIFile(filename: "MultiSource/Benchmarks/Olden/bh/newbh.c", directory: "MultiSource/Benchmarks/Olden/bh")

diff --git a/llvm/test/CodeGen/X86/2012-11-30-misched-dbg.ll b/llvm/test/CodeGen/X86/2012-11-30-misched-dbg.ll
@@ -65,7 +65,7 @@ declare i32 @__sprintf_chk(i8*, i32, i64, i8*, ...)
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!35}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.3 (trunk 168918) (llvm/trunk 168920)", isOptimized: true, emissionKind: 0, file: !19, enums: !2, retainedTypes: !2, subprograms: !20, globals: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.3 (trunk 168918) (llvm/trunk 168920)", isOptimized: true, emissionKind: 0, file: !19, enums: !2, retainedTypes: !2, subprograms: !20, globals: !2)
 !1 = !{!2}
 !2 = !{}
 !4 = !DILocalVariable(name: "num1", line: 815, scope: !5, file: !14, type: !15)
@@ -134,7 +134,7 @@ declare void @_Znwm()
 
 !llvm.dbg.cu = !{!30}
 
-!30 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.3 (trunk 169129) (llvm/trunk 169135)", isOptimized: true, emissionKind: 0, file: !34, enums: !2, retainedTypes: !2, subprograms: !36)
+!30 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.3 (trunk 169129) (llvm/trunk 169135)", isOptimized: true, emissionKind: 0, file: !34, enums: !2, retainedTypes: !2, subprograms: !36)
 !31 = !DILocalVariable(name: "X", line: 29, scope: !37, type: !32)
 !32 = !DIDerivedType(tag: DW_TAG_typedef, name: "HM", line: 28, file: !34, baseType: null)
 !33 = !DIFile(filename: "SingleSource/Benchmarks/Shootout-C++/hash.cpp", directory: "SingleSource/Benchmarks/Shootout-C++")

diff --git a/llvm/test/CodeGen/X86/2012-11-30-regpres-dbg.ll b/llvm/test/CodeGen/X86/2012-11-30-regpres-dbg.ll
@@ -36,7 +36,7 @@ invoke.cont44:                                    ; preds = %if.end
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!8}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.3 (trunk 168984) (llvm/trunk 168983)", isOptimized: true, emissionKind: 0, file: !6, subprograms: !1)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.3 (trunk 168984) (llvm/trunk 168983)", isOptimized: true, emissionKind: 0, file: !6, subprograms: !1)
 !1 = !{!2}
 !2 = !DISubprogram(name: "test", isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 1, file: !6, scope: !5, type: !7, function: void ()* @test)
 !3 = !DILocalVariable(name: "callback", line: 214, scope: !2, type: !4)

diff --git a/llvm/test/CodeGen/X86/MachineSink-DbgValue.ll b/llvm/test/CodeGen/X86/MachineSink-DbgValue.ll
@@ -28,7 +28,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!22}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "Apple clang version 3.0 (tags/Apple/clang-211.10.1) (based on LLVM 3.0svn)", isOptimized: true, emissionKind: 1, file: !20, enums: !21, retainedTypes: !21, subprograms: !18, imports:  null)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "Apple clang version 3.0 (tags/Apple/clang-211.10.1) (based on LLVM 3.0svn)", isOptimized: true, emissionKind: 1, file: !20, enums: !21, retainedTypes: !21, subprograms: !18, imports:  null)
 !1 = !DISubprogram(name: "foo", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, file: !20, scope: !2, type: !3, function: i32 (i32, i32*)* @foo, variables: !19)
 !2 = !DIFile(filename: "a.c", directory: "/private/tmp")
 !3 = !DISubroutineType(types: !4)

diff --git a/llvm/test/CodeGen/X86/StackColoring-dbg.ll b/llvm/test/CodeGen/X86/StackColoring-dbg.ll
@@ -27,7 +27,7 @@ declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind
 
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!23}
-!0 = !DICompileUnit(language: DW_LANG_C89, producer: "clang", isOptimized: true, emissionKind: 0, file: !1, enums: !{}, retainedTypes: !{})
+!0 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "clang", isOptimized: true, emissionKind: 0, file: !1, enums: !{}, retainedTypes: !{})
 !1 = !DIFile(filename: "t.c", directory: "")
 !16 = !DIBasicType(tag: DW_TAG_base_type, name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
 !2 = !DISubprogram()

diff --git a/llvm/test/CodeGen/X86/dbg-changes-codegen-branch-folding.ll b/llvm/test/CodeGen/X86/dbg-changes-codegen-branch-folding.ll
@@ -113,7 +113,7 @@ attributes #2 = { nounwind readnone }
 !llvm.module.flags = !{!44, !45}
 !llvm.ident = !{!46}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !23, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !23, globals: !2, imports: !2)
 !1 = !DIFile(filename: "dbg-changes-codegen-branch-folding.cpp", directory: "/tmp/dbginfo")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/CodeGen/X86/dbg-combine.ll b/llvm/test/CodeGen/X86/dbg-combine.ll
@@ -74,7 +74,7 @@ attributes #2 = { nounwind }
 !llvm.module.flags = !{!9, !10}
 !llvm.ident = !{!11}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.7.0 (trunk 227074)", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.7.0 (trunk 227074)", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "dbg-combine.c", directory: "/home/probinson/projects/scratch")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/CodeGen/X86/dwarf-comp-dir.ll b/llvm/test/CodeGen/X86/dwarf-comp-dir.ll
@@ -7,7 +7,7 @@ target triple = "x86_64-unknown-linux-gnu"
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!5}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.1 (trunk 143523)", isOptimized: true, emissionKind: 0, file: !4, enums: !2, retainedTypes: !7, subprograms: !2, globals: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.1 (trunk 143523)", isOptimized: true, emissionKind: 0, file: !4, enums: !2, retainedTypes: !7, subprograms: !2, globals: !2)
 !2 = !{}
 !3 = !DIFile(filename: "empty.c", directory: "/home/nlewycky")
 !4 = !DIFile(filename: "empty.c", directory: "/home/nlewycky")

diff --git a/llvm/test/CodeGen/X86/fpstack-debuginstr-kill.ll b/llvm/test/CodeGen/X86/fpstack-debuginstr-kill.ll
@@ -43,7 +43,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
 
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!24, !25}
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 (http://llvm.org/git/clang 8444ae7cfeaefae031f8fedf0d1435ca3b14d90b) (http://llvm.org/git/llvm 886f0101a7d176543b831f5efb74c03427244a55)", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !21, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 (http://llvm.org/git/clang 8444ae7cfeaefae031f8fedf0d1435ca3b14d90b) (http://llvm.org/git/llvm 886f0101a7d176543b831f5efb74c03427244a55)", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !21, imports: !2)
 !1 = !DIFile(filename: "fpu_ieee.cpp", directory: "x87stackifier")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/CodeGen/X86/misched-code-difference-with-debug.ll b/llvm/test/CodeGen/X86/misched-code-difference-with-debug.ll
@@ -62,7 +62,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!22, !23}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, enums: !2, retainedTypes: !3, subprograms: !12, globals: !20, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, enums: !2, retainedTypes: !3, subprograms: !12, globals: !20, imports: !2)
 !1 = !DIFile(filename: "test.cpp", directory: "")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/CodeGen/X86/null-streamer.ll b/llvm/test/CodeGen/X86/null-streamer.ll
@@ -14,7 +14,7 @@ define void @f1() {
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!11, !13}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: " ", isOptimized: true, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !9, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: " ", isOptimized: true, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !9, imports: !2)
 !1 = !DIFile(filename: "file.c", directory: "")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/CodeGen/X86/stack-protector-dbginfo.ll b/llvm/test/CodeGen/X86/stack-protector-dbginfo.ll
@@ -25,7 +25,7 @@ attributes #0 = { sspreq }
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!21, !72}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 ", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !5, subprograms: !8, globals: !20, imports: !5)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 ", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !5, subprograms: !8, globals: !20, imports: !5)
 !1 = !DIFile(filename: "<unknown>", directory: "/Users/matt/ryan_bug")
 !2 = !{!3}
 !3 = !DICompositeType(tag: DW_TAG_enumeration_type, line: 20, size: 32, align: 32, file: !1, scope: !4, elements: !6)

diff --git a/llvm/test/CodeGen/X86/unknown-location.ll b/llvm/test/CodeGen/X86/unknown-location.ll
@@ -24,7 +24,7 @@ entry:
 !0 = !DILocalVariable(name: "x", line: 1, arg: 2, scope: !1, file: !2, type: !6)
 !1 = !DISubprogram(name: "foo", linkageName: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, scopeLine: 1, file: !10, scope: !2, type: !4, function: i32 (i32, i32, i32, i32)* @foo)
 !2 = !DIFile(filename: "test.c", directory: "/dir")
-!3 = !DICompileUnit(language: DW_LANG_C99, producer: "producer", isOptimized: false, emissionKind: 0, file: !10, enums: !11, retainedTypes: !11, subprograms: !9)
+!3 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "producer", isOptimized: false, emissionKind: 0, file: !10, enums: !11, retainedTypes: !11, subprograms: !9)
 !4 = !DISubroutineType(types: !5)
 !5 = !{!6}
 !6 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/CodeGen/XCore/dwarf_debug.ll b/llvm/test/CodeGen/XCore/dwarf_debug.ll
@@ -23,7 +23,7 @@ declare void @llvm.dbg.declare(metadata, metadata, metadata)
 
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!9, !10}
-!0 = !DICompileUnit(language: DW_LANG_C99, isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "test.c", directory: "")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/2009-11-03-InsertExtractValue.ll b/llvm/test/DebugInfo/2009-11-03-InsertExtractValue.ll
@@ -9,7 +9,7 @@
 !2 = !DISubroutineType(types: !3)
 !3 = !{null}
 !4 = !DIFile(filename: "/foo", directory: "bar.cpp")
-!5 = !DICompileUnit(language: DW_LANG_C99, isOptimized: true, emissionKind: 0, file: !4, enums: !{}, retainedTypes: !{})
+!5 = distinct !DICompileUnit(language: DW_LANG_C99, isOptimized: true, emissionKind: 0, file: !4, enums: !{}, retainedTypes: !{})
 
 define <{i32, i32}> @f1() {
 ; CHECK: !dbgx ![[NUMBER:[0-9]+]]

diff --git a/llvm/test/DebugInfo/2009-11-05-DeadGlobalVariable.ll b/llvm/test/DebugInfo/2009-11-05-DeadGlobalVariable.ll
@@ -10,7 +10,7 @@ entry:
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!18}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 139632)", isOptimized: true, emissionKind: 0, file: !17, enums: !1, retainedTypes: !1, subprograms: !3, globals: !12)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 139632)", isOptimized: true, emissionKind: 0, file: !17, enums: !1, retainedTypes: !1, subprograms: !3, globals: !12)
 !1 = !{}
 !3 = !{!5}
 !5 = !DISubprogram(name: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, file: !17, scope: !6, type: !7, function: i32 ()* @foo)

diff --git a/llvm/test/DebugInfo/2009-11-06-NamelessGlobalVariable.ll b/llvm/test/DebugInfo/2009-11-06-NamelessGlobalVariable.ll
@@ -4,7 +4,7 @@
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!9}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 139632)", isOptimized: true, emissionKind: 0, file: !8, enums: !2, retainedTypes: !2, subprograms: !2, globals: !3)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 139632)", isOptimized: true, emissionKind: 0, file: !8, enums: !2, retainedTypes: !2, subprograms: !2, globals: !3)
 !2 = !{}
 !3 = !{!5}
 !5 = !DIGlobalVariable(name: "a", line: 2, isLocal: false, isDefinition: true, scope: null, file: !6, type: !7, variable: i32* @0)

diff --git a/llvm/test/DebugInfo/2009-11-10-CurrentFn.ll b/llvm/test/DebugInfo/2009-11-10-CurrentFn.ll
@@ -13,7 +13,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!18}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 139632)", isOptimized: true, emissionKind: 0, file: !17, enums: !1, retainedTypes: !1, subprograms: !3, globals: !1)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 139632)", isOptimized: true, emissionKind: 0, file: !17, enums: !1, retainedTypes: !1, subprograms: !3, globals: !1)
 !1 = !{}
 !3 = !{!5}
 !5 = !DISubprogram(name: "bar", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, file: !17, scope: !6, type: !7, function: void (i32)* @bar, variables: !9)

diff --git a/llvm/test/DebugInfo/2010-01-05-DbgScope.ll b/llvm/test/DebugInfo/2010-01-05-DbgScope.ll
@@ -14,7 +14,7 @@ entry:
 !0 = !DILocation(line: 571, column: 3, scope: !1)
 !1 = distinct !DILexicalBlock(line: 1, column: 1, file: !11, scope: !2)
 !2 = !DISubprogram(name: "foo", linkageName: "foo", line: 561, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, scope: !3, type: !4)
-!3 = !DICompileUnit(language: DW_LANG_C99, producer: "clang 1.1", isOptimized: true, emissionKind: 0, file: !11, enums: !12, retainedTypes: !12, subprograms: !13)
+!3 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang 1.1", isOptimized: true, emissionKind: 0, file: !11, enums: !12, retainedTypes: !12, subprograms: !13)
 !4 = !DISubroutineType(types: !5)
 !5 = !{!6}
 !6 = !DIBasicType(tag: DW_TAG_base_type, name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)

diff --git a/llvm/test/DebugInfo/2010-03-12-llc-crash.ll b/llvm/test/DebugInfo/2010-03-12-llc-crash.ll
@@ -12,7 +12,7 @@ entry:
 !0 = !DILocalVariable(name: "sy", line: 890, arg: 1, scope: !1, file: !2, type: !7)
 !1 = !DISubprogram(name: "foo", linkageName: "foo", line: 892, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, file: !8, scope: !3, type: !4)
 !2 = !DIFile(filename: "qpainter.h", directory: "QtGui")
-!3 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang 1.1", isOptimized: true, emissionKind: 0, file: !9, enums: !10, retainedTypes: !10)
+!3 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang 1.1", isOptimized: true, emissionKind: 0, file: !9, enums: !10, retainedTypes: !10)
 !4 = !DISubroutineType(types: !6)
 !5 = !DIFile(filename: "splineeditor.cpp", directory: "src")
 !6 = !{null}

diff --git a/llvm/test/DebugInfo/2010-03-19-DbgDeclare.ll b/llvm/test/DebugInfo/2010-03-19-DbgDeclare.ll
@@ -9,7 +9,7 @@ entry:
 }
 !llvm.dbg.cu = !{!2}
 !llvm.module.flags = !{!5}
-!2 = !DICompileUnit(language: DW_LANG_Mips_Assembler, producer: "clang version 3.3 ", isOptimized: false, emissionKind: 1, file: !4, enums: !3, retainedTypes: !3, subprograms: !3, globals: !3, imports:  !3)
+!2 = distinct !DICompileUnit(language: DW_LANG_Mips_Assembler, producer: "clang version 3.3 ", isOptimized: false, emissionKind: 1, file: !4, enums: !3, retainedTypes: !3, subprograms: !3, globals: !3, imports:  !3)
 !3 = !{}
 !0 = !DILocation(line: 662302, column: 26, scope: !1)
 !1 = !DILocalVariable(name: "foo", scope: !6)

diff --git a/llvm/test/DebugInfo/2010-03-24-MemberFn.ll b/llvm/test/DebugInfo/2010-03-24-MemberFn.ll
@@ -44,7 +44,7 @@ declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
 !2 = distinct !DILexicalBlock(line: 3, column: 0, file: !25, scope: !3)
 !3 = !DISubprogram(name: "bar", linkageName: "_Z3barv", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, scopeLine: 3, file: !25, scope: !4, type: !6, function: i32 ()* @_Z3barv)
 !4 = !DIFile(filename: "one.cc", directory: "/tmp/")
-!5 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: 0, file: !25, enums: !27, retainedTypes: !27, subprograms: !24, imports:  null)
+!5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: 0, file: !25, enums: !27, retainedTypes: !27, subprograms: !24, imports:  null)
 !6 = !DISubroutineType(types: !7)
 !7 = !{!8}
 !8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/DebugInfo/2010-04-06-NestedFnDbgInfo.ll b/llvm/test/DebugInfo/2010-04-06-NestedFnDbgInfo.ll
@@ -74,7 +74,7 @@ entry:
 !1 = distinct !DILexicalBlock(line: 15, column: 12, file: !38, scope: !2)
 !2 = !DISubprogram(name: "main", linkageName: "main", line: 15, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, scopeLine: 15, file: !38, scope: !3, type: !5, function: i32 ()* @main)
 !3 = !DIFile(filename: "one.cc", directory: "/tmp")
-!4 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang 1.5", isOptimized: false, emissionKind: 0, file: !38, enums: !39, retainedTypes: !39, subprograms: !37, imports:  null)
+!4 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang 1.5", isOptimized: false, emissionKind: 0, file: !38, enums: !39, retainedTypes: !39, subprograms: !37, imports:  null)
 !5 = !DISubroutineType(types: !6)
 !6 = !{!7}
 !7 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/DebugInfo/2010-04-19-FramePtr.ll b/llvm/test/DebugInfo/2010-04-19-FramePtr.ll
@@ -26,7 +26,7 @@ return:                                           ; preds = %entry
 !0 = !DILocation(line: 2, scope: !1)
 !1 = !DISubprogram(name: "foo", linkageName: "foo", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, scopeLine: 2, file: !10, scope: null, type: !4, function: i32 ()* @foo)
 !2 = !DIFile(filename: "a.c", directory: "/tmp")
-!3 = !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: 0, file: !10, enums: !11, retainedTypes: !11, subprograms: !9, imports:  null)
+!3 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: 0, file: !10, enums: !11, retainedTypes: !11, subprograms: !9, imports:  null)
 !4 = !DISubroutineType(types: !5)
 !5 = !{!6}
 !6 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/DebugInfo/2010-05-03-DisableFramePtr.ll b/llvm/test/DebugInfo/2010-05-03-DisableFramePtr.ll
@@ -21,7 +21,7 @@ declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
 !0 = !DILocalVariable(name: "userUPP", line: 7, arg: 1, scope: !1, file: !2, type: !6)
 !1 = !DISubprogram(name: "DisposeDMNotificationUPP", linkageName: "DisposeDMNotificationUPP", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, file: !16, scope: null, type: !4)
 !2 = !DIFile(filename: "t.c", directory: "/Users/echeng/LLVM/radars/r7937664/")
-!3 = !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build 9999)", isOptimized: true, emissionKind: 0, file: !16, enums: !17, retainedTypes: !17, subprograms: !18)
+!3 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build 9999)", isOptimized: true, emissionKind: 0, file: !16, enums: !17, retainedTypes: !17, subprograms: !18)
 !4 = !DISubroutineType(types: !5)
 !5 = !{null, !6}
 !6 = !DIDerivedType(tag: DW_TAG_typedef, name: "DMNotificationUPP", line: 6, file: !16, scope: !2, baseType: !7)

diff --git a/llvm/test/DebugInfo/2010-05-03-OriginDIE.ll b/llvm/test/DebugInfo/2010-05-03-OriginDIE.ll
@@ -54,7 +54,7 @@ declare void @uuid_LtoB(i8*, i8*)
 !1 = distinct !DILexicalBlock(line: 807, column: 0, file: !39, scope: !2)
 !2 = !DISubprogram(name: "gpt2gpm", linkageName: "gpt2gpm", line: 807, isLocal: true, isDefinition: true, virtualIndex: 6, isOptimized: false, file: !39, scope: null, type: !5)
 !3 = !DIFile(filename: "G.c", directory: "/tmp")
-!4 = !DICompileUnit(language: DW_LANG_C89, producer: "llvm-gcc", isOptimized: true, emissionKind: 0, file: !39, enums: !18, retainedTypes: !18, subprograms: !40)
+!4 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "llvm-gcc", isOptimized: true, emissionKind: 0, file: !39, enums: !18, retainedTypes: !18, subprograms: !40)
 !5 = !DISubroutineType(types: !6)
 !6 = !{null}
 !7 = !DILocation(line: 810, scope: !1)

diff --git a/llvm/test/DebugInfo/2010-05-10-MultipleCU.ll b/llvm/test/DebugInfo/2010-05-10-MultipleCU.ll
@@ -26,15 +26,15 @@ return:
 !1 = distinct !DILexicalBlock(line: 2, column: 0, file: !18, scope: !2)
 !2 = !DISubprogram(name: "foo", linkageName: "foo", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, file: !18, scope: !3, type: !5, function: i32 ()* @foo)
 !3 = !DIFile(filename: "a.c", directory: "/tmp/")
-!4 = !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: 0, file: !18, enums: !19, retainedTypes: !19, subprograms: !16)
+!4 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: 0, file: !18, enums: !19, retainedTypes: !19, subprograms: !16)
 !5 = !DISubroutineType(types: !6)
 !6 = !{!7}
 !7 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
 !8 = !DILocation(line: 3, scope: !9)
 !9 = distinct !DILexicalBlock(line: 2, column: 0, file: !20, scope: !10)
 !10 = !DISubprogram(name: "bar", linkageName: "bar", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, file: !20, scope: !11, type: !13, function: i32 ()* @bar)
 !11 = !DIFile(filename: "b.c", directory: "/tmp/")
-!12 = !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: 0, file: !20, enums: !19, retainedTypes: !19, subprograms: !17)
+!12 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: 0, file: !20, enums: !19, retainedTypes: !19, subprograms: !17)
 !13 = !DISubroutineType(types: !14)
 !14 = !{!15}
 !15 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/DebugInfo/2010-06-29-InlinedFnLocalVar.ll b/llvm/test/DebugInfo/2010-06-29-InlinedFnLocalVar.ll
@@ -27,7 +27,7 @@ entry:
 
 !0 = !DISubprogram(name: "foo", line: 9, isLocal: true, isDefinition: true, virtualIndex: 6, isOptimized: true, scopeLine: 9, file: !27, scope: !1, type: !3, variables: !24)
 !1 = !DIFile(filename: "bar.c", directory: "/tmp/")
-!2 = !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: 0, file: !27, enums: !20, retainedTypes: !20, subprograms: !25, globals: !26, imports:  !20)
+!2 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: 0, file: !27, enums: !20, retainedTypes: !20, subprograms: !25, globals: !26, imports:  !20)
 !3 = !DISubroutineType(types: !4)
 !4 = !{!5, !5}
 !5 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/DebugInfo/2010-07-19-Crash.ll b/llvm/test/DebugInfo/2010-07-19-Crash.ll
@@ -14,7 +14,7 @@ entry:
 
 !0 = !DISubprogram(name: "bar", linkageName: "bar", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, file: !12, scope: !1, type: !3, function: i32 ()* @bar)
 !1 = !DIFile(filename: "one.c", directory: "/private/tmp")
-!2 = !DICompileUnit(language: DW_LANG_C99, producer: "clang 2.8", isOptimized: true, emissionKind: 0, file: !12, enums: !14, retainedTypes: !14, subprograms: !13)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang 2.8", isOptimized: true, emissionKind: 0, file: !12, enums: !14, retainedTypes: !14, subprograms: !13)
 !3 = !DISubroutineType(types: !4)
 !4 = !{!5}
 !5 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/DebugInfo/2010-10-01-crash.ll b/llvm/test/DebugInfo/2010-10-01-crash.ll
@@ -15,7 +15,7 @@ declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32,
 !llvm.module.flags = !{!27}
 !0 = !DISubprogram(name: "CGRectStandardize", linkageName: "CGRectStandardize", line: 54, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, file: !1, scope: null, function: void (i32*, i32*)* @CGRectStandardize)
 !1 = !DIFile(filename: "GSFusedSilica.m", directory: "/Volumes/Data/Users/sabre/Desktop")
-!2 = !DICompileUnit(language: DW_LANG_ObjC, producer: "clang version 2.9 (trunk 115292)", isOptimized: true, runtimeVersion: 1, emissionKind: 0, file: !25, enums: !26, retainedTypes: !26)
+!2 = distinct !DICompileUnit(language: DW_LANG_ObjC, producer: "clang version 2.9 (trunk 115292)", isOptimized: true, runtimeVersion: 1, emissionKind: 0, file: !25, enums: !26, retainedTypes: !26)
 !5 = !DIDerivedType(tag: DW_TAG_typedef, name: "CGRect", line: 49, file: !25, baseType: null)
 !23 = !DILocalVariable(name: "rect", line: 53, arg: 2, scope: !0, file: !1, type: !5)
 !24 = !DILocation(line: 53, column: 33, scope: !0)

diff --git a/llvm/test/DebugInfo/AArch64/big-endian.ll b/llvm/test/DebugInfo/AArch64/big-endian.ll
@@ -9,7 +9,7 @@ target triple = "aarch64_be--none-eabi"
 !llvm.module.flags = !{!8, !9}
 !llvm.ident = !{!10}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.6.0 ", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !2, globals: !3, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.6.0 ", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !2, globals: !3, imports: !2)
 !1 = !DIFile(filename: "-", directory: "/work/validation")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/AArch64/bitfields.ll b/llvm/test/DebugInfo/AArch64/bitfields.ll
@@ -54,7 +54,7 @@ target triple = "aarch64_be--linux-gnu"
 !llvm.module.flags = !{!13, !14, !15}
 !llvm.ident = !{!16}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0 (trunk 240548) (llvm/trunk 240554)", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !2, globals: !3, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0 (trunk 240548) (llvm/trunk 240554)", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !2, globals: !3, imports: !2)
 !1 = !DIFile(filename: "bitfields.c", directory: "/")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/AArch64/cfi-eof-prologue.ll b/llvm/test/DebugInfo/AArch64/cfi-eof-prologue.ll
@@ -61,7 +61,7 @@ attributes #3 = { nounwind }
 !llvm.module.flags = !{!35, !36}
 !llvm.ident = !{!37}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 (trunk 224279) (llvm/trunk 224283)", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !27, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 (trunk 224279) (llvm/trunk 224283)", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !27, globals: !2, imports: !2)
 !1 = !DIFile(filename: "<stdin>", directory: "")
 !2 = !{}
 !3 = !{!4, !13}

diff --git a/llvm/test/DebugInfo/AArch64/coalescing.ll b/llvm/test/DebugInfo/AArch64/coalescing.ll
@@ -44,7 +44,7 @@ attributes #3 = { nounwind optsize }
 !llvm.module.flags = !{!12, !13}
 !llvm.ident = !{!14}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 (trunk 223149) (llvm/trunk 223115)", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 (trunk 223149) (llvm/trunk 223115)", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "<stdin>", directory: "")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/AArch64/constant-dbgloc.ll b/llvm/test/DebugInfo/AArch64/constant-dbgloc.ll
@@ -23,7 +23,7 @@ entry:
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!8, !9}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false, subprograms: !3)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false, subprograms: !3)
 !1 = !DIFile(filename: "test.c", directory: "/home/user/clang/build")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/AArch64/dwarfdump.ll b/llvm/test/DebugInfo/AArch64/dwarfdump.ll
@@ -27,7 +27,7 @@ attributes #0 = { nounwind }
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!10}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.3 ", isOptimized: false, emissionKind: 0, file: !9, enums: !1, retainedTypes: !1, subprograms: !2, globals: !1, imports:  !1)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.3 ", isOptimized: false, emissionKind: 0, file: !9, enums: !1, retainedTypes: !1, subprograms: !2, globals: !1, imports:  !1)
 !1 = !{}
 !2 = !{!3}
 !3 = !DISubprogram(name: "main", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, scopeLine: 1, file: !9, scope: !4, type: !5, function: i32 ()* @main, variables: !1)

diff --git a/llvm/test/DebugInfo/AArch64/frameindices.ll b/llvm/test/DebugInfo/AArch64/frameindices.ll
@@ -160,7 +160,7 @@ attributes #5 = { builtin }
 !llvm.module.flags = !{!43, !44}
 !llvm.ident = !{!45}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.7.0 ", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !24, globals: !40, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.7.0 ", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !24, globals: !40, imports: !2)
 !1 = !DIFile(filename: "<stdin>", directory: "")
 !2 = !{}
 !3 = !{!4, !12, !14}

diff --git a/llvm/test/DebugInfo/AArch64/struct_by_value.ll b/llvm/test/DebugInfo/AArch64/struct_by_value.ll
@@ -48,7 +48,7 @@ attributes #1 = { nounwind readnone }
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!16, !20}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "LLVM version 3.4 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "LLVM version 3.4 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "struct_by_value.c", directory: "")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/ARM/PR16736.ll b/llvm/test/DebugInfo/ARM/PR16736.ll
@@ -41,7 +41,7 @@ attributes #3 = { nounwind }
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!17, !21}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 (trunk 190804) (llvm/trunk 190797)", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 (trunk 190804) (llvm/trunk 190797)", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "/<unknown>", directory: "")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/ARM/bitfield.ll b/llvm/test/DebugInfo/ARM/bitfield.ll
@@ -26,7 +26,7 @@ target triple = "thumbv7-apple-ios"
 !llvm.module.flags = !{!11, !12, !13, !14, !15}
 !llvm.ident = !{!16}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0 (trunk 240548) (llvm/trunk 240554)", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !2, globals: !3, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0 (trunk 240548) (llvm/trunk 240554)", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !2, globals: !3, imports: !2)
 !1 = !DIFile(filename: "test.i", directory: "/")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/ARM/cfi-eof-prologue.ll b/llvm/test/DebugInfo/ARM/cfi-eof-prologue.ll
@@ -62,7 +62,7 @@ attributes #3 = { nounwind }
 !llvm.module.flags = !{!35, !36, !37, !38}
 !llvm.ident = !{!39}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 (trunk 224279) (llvm/trunk 224283)", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !27, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 (trunk 224279) (llvm/trunk 224283)", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !27, globals: !2, imports: !2)
 !1 = !DIFile(filename: "<stdin>", directory: "")
 !2 = !{}
 !3 = !{!4, !13}

diff --git a/llvm/test/DebugInfo/ARM/constant-dbgloc.ll b/llvm/test/DebugInfo/ARM/constant-dbgloc.ll
@@ -23,7 +23,7 @@ entry:
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!8, !9}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false, subprograms: !3)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false, subprograms: !3)
 !1 = !DIFile(filename: "test.c", directory: "/home/user/clang/build")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/ARM/header.ll b/llvm/test/DebugInfo/ARM/header.ll
@@ -18,7 +18,7 @@ define void @f() {
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!7, !8}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "foo", isOptimized: true, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "foo", isOptimized: true, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "/foo/test.c", directory: "/foo")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/ARM/lowerbdgdeclare_vla.ll b/llvm/test/DebugInfo/ARM/lowerbdgdeclare_vla.ll
@@ -67,7 +67,7 @@ attributes #1 = { nounwind readnone }
 !llvm.module.flags = !{!20, !33}
 !llvm.ident = !{!21}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.4 ", isOptimized: true, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.4 ", isOptimized: true, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "<unknown>", directory: "/Volumes/Data/radar/15464571")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/ARM/multiple-constant-uses-drops-dbgloc.ll b/llvm/test/DebugInfo/ARM/multiple-constant-uses-drops-dbgloc.ll
@@ -32,7 +32,7 @@ attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"=
 !llvm.module.flags = !{!12, !13, !14, !15}
 !llvm.ident = !{!16}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false, subprograms: !3)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false, subprograms: !3)
 !1 = !DIFile(filename: "test.c", directory: "/home/user/clang/build")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/ARM/s-super-register.ll b/llvm/test/DebugInfo/ARM/s-super-register.ll
@@ -40,7 +40,7 @@ declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnon
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!20}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.0 (trunk 130845)", isOptimized: true, emissionKind: 1, file: !18, enums: !19, retainedTypes: !19, subprograms: !16, imports:  null)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.0 (trunk 130845)", isOptimized: true, emissionKind: 1, file: !18, enums: !19, retainedTypes: !19, subprograms: !16, imports:  null)
 !1 = !DISubprogram(name: "foo", linkageName: "_Z3foov", line: 5, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 5, file: !18, scope: !2, type: !3, function: void ()* @_Z3foov, variables: !17)
 !2 = !DIFile(filename: "k.cc", directory: "/private/tmp")
 !3 = !DISubroutineType(types: !4)

diff --git a/llvm/test/DebugInfo/ARM/single-constant-use-preserves-dbgloc.ll b/llvm/test/DebugInfo/ARM/single-constant-use-preserves-dbgloc.ll
@@ -48,7 +48,7 @@ declare void @llvm.dbg.declare(metadata, metadata, metadata)
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!8, !9}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false, subprograms: !3)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false, subprograms: !3)
 !1 = !DIFile(filename: "test.c", directory: "/home/user/clang/build")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/ARM/tls.ll b/llvm/test/DebugInfo/ARM/tls.ll
@@ -22,7 +22,7 @@
 ; TODO: Add expected output for -emulated-tls tests.
 ; EMU-NOT: .long x(tlsldo)
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !2, globals: !3, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !2, globals: !3, imports: !2)
 !1 = !DIFile(filename: "tls.c", directory: "/tmp")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/COFF/asan-module-ctor.ll b/llvm/test/DebugInfo/COFF/asan-module-ctor.ll
@@ -82,7 +82,7 @@ attributes #0 = { nounwind sanitize_address "less-precise-fpmad"="false" "no-fra
 !llvm.module.flags = !{!7, !8}
 !llvm.ident = !{!9}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 2, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 2, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "asan.c", directory: "D:\5C")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/COFF/asan-module-without-functions.ll b/llvm/test/DebugInfo/COFF/asan-module-without-functions.ll
@@ -45,7 +45,7 @@ define internal void @asan.module_dtor() {
 !llvm.module.flags = !{!3, !4}
 !llvm.ident = !{!5}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 2, file: !1, enums: !2, retainedTypes: !2, subprograms: !2, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 2, file: !1, enums: !2, retainedTypes: !2, subprograms: !2, globals: !2, imports: !2)
 !1 = !DIFile(filename: "asan.c", directory: "D:\5C")
 !2 = !{}
 !3 = !{i32 2, !"Dwarf Version", i32 4}

diff --git a/llvm/test/DebugInfo/COFF/asm.ll b/llvm/test/DebugInfo/COFF/asm.ll
@@ -270,7 +270,7 @@ attributes #2 = { nounwind }
 !llvm.module.flags = !{!9, !10}
 !llvm.ident = !{!11}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "<unknown>", directory: "D:\5C")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/COFF/cpp-mangling.ll b/llvm/test/DebugInfo/COFF/cpp-mangling.ll
@@ -29,7 +29,7 @@ attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"=
 !llvm.module.flags = !{!8, !9}
 !llvm.ident = !{!10}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 ", isOptimized: false, emissionKind: 2, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 ", isOptimized: false, emissionKind: 2, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "<stdin>", directory: "D:\5C")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/COFF/multifile.ll b/llvm/test/DebugInfo/COFF/multifile.ll
@@ -346,7 +346,7 @@ attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "
 !llvm.module.flags = !{!9, !10}
 !llvm.ident = !{!11}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "<unknown>", directory: "D:\5C")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/COFF/multifunction.ll b/llvm/test/DebugInfo/COFF/multifunction.ll
@@ -667,7 +667,7 @@ attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "
 !llvm.module.flags = !{!11, !12}
 !llvm.ident = !{!13}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "<unknown>", directory: "D:\5C")
 !2 = !{}
 !3 = !{!4, !9, !10}

diff --git a/llvm/test/DebugInfo/COFF/simple.ll b/llvm/test/DebugInfo/COFF/simple.ll
@@ -246,7 +246,7 @@ attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "
 !llvm.module.flags = !{!9, !10}
 !llvm.ident = !{!11}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "<unknown>", directory: "D:\5C")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/COFF/tail-call-without-lexical-scopes.ll b/llvm/test/DebugInfo/COFF/tail-call-without-lexical-scopes.ll
@@ -62,7 +62,7 @@ attributes #2 = { nounwind }
 !llvm.module.flags = !{!8, !9}
 !llvm.ident = !{!10}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: true, emissionKind: 2, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: true, emissionKind: 2, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "test.cpp", directory: "D:\5C")
 !2 = !{}
 !3 = !{!4, !7}

diff --git a/llvm/test/DebugInfo/Inputs/gmlt.ll b/llvm/test/DebugInfo/Inputs/gmlt.ll
@@ -131,7 +131,7 @@ attributes #2 = { nounwind }
 !llvm.module.flags = !{!10, !11}
 !llvm.ident = !{!12}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 ", isOptimized: false, emissionKind: 2, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 ", isOptimized: false, emissionKind: 2, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "gmlt.cpp", directory: "/tmp/dbginfo")
 !2 = !{}
 !3 = !{!4, !7, !8, !9}

diff --git a/llvm/test/DebugInfo/Inputs/line.ll b/llvm/test/DebugInfo/Inputs/line.ll
@@ -39,7 +39,7 @@ attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointe
 !llvm.module.flags = !{!7, !8}
 !llvm.ident = !{!9}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.7.0 (trunk 227472) (llvm/trunk 227476)", isOptimized: false, emissionKind: 2, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.7.0 (trunk 227472) (llvm/trunk 227476)", isOptimized: false, emissionKind: 2, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "line.cpp", directory: "/tmp/dbginfo")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/Mips/InlinedFnLocalVar.ll b/llvm/test/DebugInfo/Mips/InlinedFnLocalVar.ll
@@ -27,7 +27,7 @@ entry:
 
 !0 = !DISubprogram(name: "foo", line: 9, isLocal: true, isDefinition: true, virtualIndex: 6, isOptimized: true, scopeLine: 9, file: !27, scope: !1, type: !3, variables: !24)
 !1 = !DIFile(filename: "bar.c", directory: "/tmp/")
-!2 = !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: 0, file: !27, enums: !20, retainedTypes: !20, subprograms: !25, globals: !26, imports:  !20)
+!2 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: 0, file: !27, enums: !20, retainedTypes: !20, subprograms: !25, globals: !26, imports:  !20)
 !3 = !DISubroutineType(types: !4)
 !4 = !{!5, !5}
 !5 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/DebugInfo/Mips/delay-slot.ll b/llvm/test/DebugInfo/Mips/delay-slot.ll
@@ -56,7 +56,7 @@ attributes #1 = { nounwind readnone }
 !llvm.module.flags = !{!9, !10}
 !llvm.ident = !{!11}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "test.c", directory: "/tmp")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/Mips/fn-call-line.ll b/llvm/test/DebugInfo/Mips/fn-call-line.ll
@@ -68,7 +68,7 @@ attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "n
 !llvm.module.flags = !{!8, !9}
 !llvm.ident = !{!10}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.7.0 (trunk 226641)", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.7.0 (trunk 226641)", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "fn-call-line.c", directory: "/tmp/dbginfo")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/PR20038.ll b/llvm/test/DebugInfo/PR20038.ll
@@ -120,7 +120,7 @@ attributes #2 = { nounwind readnone }
 !llvm.module.flags = !{!18, !19}
 !llvm.ident = !{!20}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !11, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !11, globals: !2, imports: !2)
 !1 = !DIFile(filename: "<stdin>", directory: "/tmp/dbginfo")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/PowerPC/tls-fission.ll b/llvm/test/DebugInfo/PowerPC/tls-fission.ll
@@ -22,7 +22,7 @@
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!7, !8}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 ", isOptimized: false, splitDebugFilename: "tls.dwo", emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !2, globals: !3, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 ", isOptimized: false, splitDebugFilename: "tls.dwo", emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !2, globals: !3, imports: !2)
 !1 = !DIFile(filename: "tls.cpp", directory: "/tmp")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/PowerPC/tls.ll b/llvm/test/DebugInfo/PowerPC/tls.ll
@@ -17,7 +17,7 @@
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!7, !8}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !2, globals: !3, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !2, globals: !3, imports: !2)
 !1 = !DIFile(filename: "tls.cpp", directory: "/tmp")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/Sparc/gnu-window-save.ll b/llvm/test/DebugInfo/Sparc/gnu-window-save.ll
@@ -55,7 +55,7 @@ attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "n
 !llvm.module.flags = !{!9, !10}
 !llvm.ident = !{!11}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 (http://llvm.org/git/clang.git 6a0714fee07fb7c4e32d3972b4fe2ce2f5678cf4) (llvm/ 672e88e934757f76d5c5e5258be41e7615094844)", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 (http://llvm.org/git/clang.git 6a0714fee07fb7c4e32d3972b4fe2ce2f5678cf4) (llvm/ 672e88e934757f76d5c5e5258be41e7615094844)", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
 !1 = !DIFile(filename: "hello.c", directory: "/home/venkatra/work/benchmarks/test/hello")
 !2 = !{}
 !3 = !{!4}

diff --git a/llvm/test/DebugInfo/SystemZ/variable-loc.ll b/llvm/test/DebugInfo/SystemZ/variable-loc.ll
@@ -52,7 +52,7 @@ declare i32 @printf(i8*, ...)
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!30}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.2 ", isOptimized: false, emissionKind: 0, file: !29, enums: !1, retainedTypes: !1, subprograms: !3, globals: !1, imports:  !1)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.2 ", isOptimized: false, emissionKind: 0, file: !29, enums: !1, retainedTypes: !1, subprograms: !3, globals: !1, imports:  !1)
 !1 = !{}
 !3 = !{!5, !11, !14}
 !5 = !DISubprogram(name: "populate_array", line: 4, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 4, file: !29, scope: !6, type: !7, function: void (i32*, i32)* @populate_array, variables: !1)

diff --git a/llvm/test/DebugInfo/X86/2010-04-13-PubType.ll b/llvm/test/DebugInfo/X86/2010-04-13-PubType.ll
@@ -34,7 +34,7 @@ declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
 !0 = !DILocalVariable(name: "x", line: 7, arg: 1, scope: !1, file: !2, type: !7)
 !1 = !DISubprogram(name: "foo", linkageName: "foo", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, scopeLine: 7, file: !18, scope: !2, type: !4, function: i32 (%struct.X*, %struct.Y*)* @foo)
 !2 = !DIFile(filename: "a.c", directory: "/tmp/")
-!3 = !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: 0, file: !18, enums: !19, retainedTypes: !19, subprograms: !17, imports:  null)
+!3 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: 0, file: !18, enums: !19, retainedTypes: !19, subprograms: !17, imports:  null)
 !4 = !DISubroutineType(types: !5)
 !5 = !{!6, !7, !9}
 !6 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)

diff --git a/llvm/test/DebugInfo/X86/2011-09-26-GlobalVarContext.ll b/llvm/test/DebugInfo/X86/2011-09-26-GlobalVarContext.ll
@@ -19,7 +19,7 @@ declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!21}
 
-!0 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk)", isOptimized: false, emissionKind: 0, file: !20, enums: !1, retainedTypes: !1, subprograms: !3, globals: !12, imports:  !1)
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk)", isOptimized: false, emissionKind: 0, file: !20, enums: !1, retainedTypes: !1, subprograms: !3, globals: !12, imports:  !1)
 !1 = !{}
 !3 = !{!5}
 !5 = !DISubprogram(name: "f", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, file: !6, scope: !6, type: !7, function: i32 ()* @f)

diff --git a/llvm/test/DebugInfo/X86/2011-12-16-BadStructRef.ll b/llvm/test/DebugInfo/X86/2011-12-16-BadStructRef.ll
@@ -89,7 +89,7 @@ entry:
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!83}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.1 (trunk 146596)", isOptimized: false, emissionKind: 0, file: !82, enums: !1, retainedTypes: !3, subprograms: !27, globals: !1, imports:  !1)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.1 (trunk 146596)", isOptimized: false, emissionKind: 0, file: !82, enums: !1, retainedTypes: !3, subprograms: !27, globals: !1, imports:  !1)
 !1 = !{}
 !3 = !{!5, !9}
 !5 = !DICompositeType(tag: DW_TAG_class_type, name: "bar", line: 9, size: 128, align: 64, file: !82, elements: !7)

diff --git a/llvm/test/DebugInfo/X86/DW_AT_byte_size.ll b/llvm/test/DebugInfo/X86/DW_AT_byte_size.ll
@@ -26,7 +26,7 @@ declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!21}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.1 (trunk 150996)", isOptimized: false, emissionKind: 0, file: !20, enums: !1, retainedTypes: !1, subprograms: !3, globals: !1, imports:  !1)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.1 (trunk 150996)", isOptimized: false, emissionKind: 0, file: !20, enums: !1, retainedTypes: !1, subprograms: !3, globals: !1, imports:  !1)
 !1 = !{}
 !3 = !{!5}
 !5 = !DISubprogram(name: "foo", linkageName: "_Z3fooP1A", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 3, file: !20, scope: !6, type: !7, function: i32 (%struct.A*)* @_Z3fooP1A)

diff --git a/llvm/test/DebugInfo/X86/DW_AT_linkage_name.ll b/llvm/test/DebugInfo/X86/DW_AT_linkage_name.ll
@@ -77,7 +77,7 @@ attributes #2 = { ssp uwtable }
 !llvm.module.flags = !{!23, !24}
 !llvm.ident = !{!25}
 
-!0 = !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !16, globals: !2, imports: !2)
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !16, globals: !2, imports: !2)
 !1 = !DIFile(filename: "linkage-name.cpp", directory: "")
 !2 = !{}
 !3 = !{!4}